Packet detection threshold calibration with antenna connected

Abstract

Systems and methods for determining a packet detection threshold for a wireless device with the antenna connected are disclosed. An energy detection algorithm, averaging algorithm and threshold computation algorithm may be performed to determine the packet detection threshold.

What is claimed is: 
     
         1 . A wireless device comprising:
 a receiver to receive a receive signal from one or more other wireless devices;   an antenna coupled to the receiver;   a processor configured to detect an energy level of signals received at the receiver, determine the average noise power of the signals received at the receiver and compute a packet detection threshold that exceeds the average noise floor of the wireless device; and   memory to store the packet detection threshold.   
     
     
         2 . The wireless device of  claim 1 , wherein the packet detection threshold is variable. 
     
     
         3 . The wireless device of  claim 2 , wherein the threshold for packet detection is variable over temperature. 
     
     
         4 . The wireless device of  claim 2 , wherein the wireless device is configured to detect packets when the energy level of the signal exceeds the packet detection threshold. 
     
     
         5 . The wireless device of  claim 2 , wherein the packet detection threshold is adjusted according to the noise floor. 
     
     
         6 . A method comprising:
 performing an energy detection algorithm at a wireless device having an antenna connected thereto on a plurality of wireless signals received at the wireless device; and   applying a noise power averaging algorithm to determine a noise floor measurement for the wireless device with the antenna connected.   
     
     
         7 . The method of  claim 6 , further comprising performing a threshold computation based on the average noise floor determined by the noise power averaging algorithm. 
     
     
         8 . The method of  claim 6 , wherein performing the energy detection algorithm comprises computing a total energy of a signal captured at the antenna of the wireless device. 
     
     
         9 . The method of  claim 8 , further comprising comparing the total energy of the captured signal to a previously averaged value. 
     
     
         10 . The method of  claim 5 , wherein the computed energy value is discarded if it is higher than the previously averaged value. 
     
     
         11 . The method of  claim 9 , wherein the computed energy value is used in the averaging algorithm if the energy is lower than the previously averaged value. 
     
     
         12 . The method of  claim 9 , wherein the previously averaged value is discarded if the computed energy value is significantly lower than previous value. 
     
     
         13 . The method of  claim 6 , wherein the average noise power level is the true noise floor of the wireless device. 
     
     
         14 . The method of  claim 7 , wherein the threshold computation determines a threshold for packet detection. 
     
     
         15 . The method of  claim 14 , wherein the threshold is variable. 
     
     
         16 . The method of  claim 14 , wherein the threshold for packet detection is variable over temperature. 
     
     
         17 . The method of  claim 14 , wherein the wireless device detects packets when the signal energy exceeds the threshold. 
     
     
         18 . The method of  claim 14 , wherein the threshold for packet detection is adjusted according to the noise floor.